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<!doctype html>
<meta charset="utf-8">
<title>CSS Scrollbars: scrollbar-width none on the root overrides ::-webkit-scrollbar on the root</title>
<link rel="author" title="Luke Warlow" href="mailto:luke@warlow.dev" />
<link rel="help" href="https://drafts.csswg.org/css-scrollbars-1/#width-compat" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<style>
:root {
scrollbar-width: none;
}
:root::-webkit-scrollbar {
width: 20px;
background-color: lightgray;
}
:root,
body {
margin: 0;
padding: 0;
}
#content {
height: 10vh;
width: 100%;
background: lightsalmon;
}
#expander {
/* force vertical scroll */
height: 200vh;
width: 300px;
background: gray;
}
</style>
<body>
<div id="content"></div>
<div id="expander"></div>
<script>
test(function () {
let root = document.documentElement;
let body = document.body;
let content = document.getElementById('content');
assert_equals(root.offsetWidth, window.innerWidth, "viewport does not show a scrollbar");
assert_equals(body.offsetWidth, root.offsetWidth, "body matches root");
assert_equals(content.offsetWidth, body.offsetWidth, "content matches body");
}, "scrollbar-width none on the root overrides ::-webkit-scrollbar");
</script>
</body>
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